Home/Species/ Howell's Bentgrass

Agrostis howellii

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Howell's Bentgrass

G2Imperiled Found in 1 roadless area NatureServe Explorer →

G2ImperiledGlobal Rank

UnknownThreat Impact

Identity

Unique IDELEMENT_GLOBAL.2.158821

Element CodePMPOA040N0

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

Endemicendemic to a single state or province

KingdomPlantae

PhylumAnthophyta

ClassMonocotyledoneae

OrderCyperales

FamilyPoaceae

GenusAgrostis

Other Common Names

Howell's bentgrass (EN)

Concept Reference

Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

Conservation Status

Rank MethodLegacy Rank calculation - Excel v3.1x

Review Date2014-06-14

Change Date1991-02-05

Edition Date2014-06-14

Edition AuthorsVrilakas, S., rev. A. Tomaino (2014)

Threat ImpactUnknown

Range Extent<100 square km (less than about 40 square miles)

Number of Occurrences6 - 20

Rank Reasons

An Oregon endemic that is known from eleven sites, all but one of which are within the Columbia River Gorge National Scenic Area.

Range Extent Comments

Known only from western Oregon near the Columbia River Gorge and from one site in the Coburg Hills of Linn County, Oregon (Oregon Flora Project 2011). Flora of North America Editorial Committee (2007) reports Agrostis howellii from Washington state; however, this is apparently based on a false report from Thurston County, Washington (D. Giblin, pers. comm., 2014).

Occurrences Comments

Approximately 11 extant occurrences (EO data in the NatureServe central database as of February 2014).

Threat Impact Comments

Most sites are on public land in a national scenic area, with little chance for large human-based disturbances. There may be potential threats from recreational use. As of 2014, no new information about threats to this species was found.

Ecology & Habitat

Habitat

Mostly known from damp, vertical cliffs and talus slopes along streams in the Columbia River Gorge. One site, about 160 km from the Gorge, is in a opening within an Oregon ash-vine maple (Fraxinus latifolius-Acer circinatum) forest. Occurs in shady woodlands and at the base of cliffs (Flora of North America Editorial Committee 2007).

Terrestrial Habitats

Forest/WoodlandForest - HardwoodBare rock/talus/screeCliff

Palustrine Habitats

HERBACEOUS WETLANDRiparian

Other Nations (1)

United StatesN2

Province	Rank	Native
Oregon	S2	Yes

Plant Characteristics

Economic Value (Genus)No

Roadless Areas (1)

Oregon (1)

Area	Forest	Acres
Eagle	Mt. Hood National Forest	16,841

References (5)

Flora of North America Editorial Committee (FNA). 2007a. Flora of North America north of Mexico. Vol. 24. Magnoliophyta: Commelinidae (in part): Poaceae, part 1. Oxford Univ. Press, New York. xxviii + 911 pp.
Hitchcock, A.S. 1951. Manual of the grasses of the United States. 2nd edition revised by Agnes Chase. [Reprinted, 1971, in 2 vols., by Dover Publications, Incorporated, New York.]
Hitchcock, C.L., and A. Cronquist. 1973. Flora of the Pacific Northwest: An Illustrated Manual. University of Washington Press, Seattle, Washington. 730 pp.
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Oregon Flora Project. 2011. Rare Plant Guide. Online. Available: http://www.oregonflora.org/rareplants.php?#sr (Accessed 2014).